disease developing time

The disease indexes of varieties were varying with growth because of the diseased time and the disease developing speed.

受发病时间和发病速度的影响，不同生长阶段品种间感病程度发生相应变化。

The variety of cotton with the later diseased time and the lower disease developing speed was the ideal parent material of disease-resisted breeding.

在抗病育种中，发病时间晚和发病速度慢的品种（系）是较为理想的抗病亲本。

There was statistical significance of the diseased time among varieties, and so did the disease developing rate.

由于发病时间和发病速度的不同，导致了不同生长阶段品种间感病程度的相应变化。